NA48/2 studies of rare decays

M. Raggi, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch-Devaux, G. Bocquet, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J. B. ChèzeM. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, P. Dalpiaz, C. Damiani, M. De Beer, J. Derré, H. Dibon, L. DiLella, N. Doble, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P. L. Frabetti, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, M. Velasco, NA48/2 Collaboration

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The first observation of about 2000 candidates, with a background contamination below 3%, of the rare decay K± → φ± φ0e+e- is reported by the NA48/2 experiment. The preliminary branching ratio in the full kinematic region is obtained to be: B(K± → φ±φ0e+e-) = (4.06 ± 0.17) • 10-6 by analyzing the data collected in 2003. A sample of 4.687×106 K± → φ±φ0D,decay candidates with a negligible background contamination collected in 2003-04 is analyzed to search for the dark photon (A') via the decay chain K± → φ± φ0, φ0 → γA',A'→e+e-. No signal is observed, and preliminary limits in the plane dark photon mixing parameter η2 vs. its mass mA' are reported.

Original languageEnglish (US)
Article number132
JournalNuovo Cimento della Societa Italiana di Fisica C
Issue number4
StatePublished - Jul 1 2015

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Physics and Astronomy (miscellaneous)


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